Description: The CityLots spatial data layer is a representation of the City and County of San Francisco's Subdivision parcels. Each of the 198,000-plus polygons has a unique BLKLOT identifier which is the Assessor Parcel Number (APN). Multiple level (condominium, live/work, et al.) lots are represented as well, with their ground or base lot being the MAPBLKLOT key.
Copyright Text: City and County of San Francisco Department of Public Works/Bureau of Street-Use and Mapping